Lower wireless base station, upper wireless base station, and wireless base station system

摘要

A lower base station (20) according to the present invention includes: a CSI acquisition unit (221) that acquires channel information indicating a channel state between the lower base station (20) and one or more mobile terminals; a lower scheduler unit (21) that transmits the channel information to a higher base station (10), and determines the number of signal streams and a modulation and coding scheme for a destination terminal that is a mobile terminal selected from among the one or more mobile terminals, based on the destination terminal and a data transmission rate for the destination terminal, sent for notification by the higher radio base station; and an MU-MIMO signal processing unit (222) that performs Multi User-Multiple Input Multiple Output precoding for the mobile terminal.